What is a flag of a Microprocessor 8085 and role of it?

It is a very vital question that what is a flag of a Microprocessor 8085 and what is a role of it? Because if you are thinking to get good marks in microprocessor then you have to know it clearly. Without have clear idea on it, it is very difficult to do any program. Because of that only i upload the video tutorial. And I am sure that It makes you understand better. Here I give you a video tutorial on 

what is a flag of a Microprocessor 8085 and role of it?

Must see that video it is 8.55 minute long. It will help to understand the matter easily.

Also I give you the pdf of it. You can download it by clicking bellow link. Please if you feel it is helpful then must reply .

 DOWNLOAD  ( pdf of video presentation )